CVE-2025-37891 (GCVE-0-2025-37891)
Vulnerability from cvelistv5
Published
2025-05-19 07:19
Modified
2025-05-26 05:23
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: ump: Fix buffer overflow at UMP SysEx message conversion The conversion function from MIDI 1.0 to UMP packet contains an internal buffer to keep the incoming MIDI bytes, and its size is 4, as it was supposed to be the max size for a MIDI1 UMP packet data. However, the implementation overlooked that SysEx is handled in a different format, and it can be up to 6 bytes, as found in do_convert_to_ump(). It leads eventually to a buffer overflow, and may corrupt the memory when a longer SysEx message is received. The fix is simply to extend the buffer size to 6 to fit with the SysEx UMP message.
References
Impacted products
Vendor Product Version
Linux Linux Version: 0b5288f5fe63eab687c14e5940b9e0d532b129f2
Version: 0b5288f5fe63eab687c14e5940b9e0d532b129f2
Version: 0b5288f5fe63eab687c14e5940b9e0d532b129f2
Version: 0b5288f5fe63eab687c14e5940b9e0d532b129f2
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/sound/ump_convert.h"
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          "vendor": "Linux",
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          "vendor": "Linux",
          "versions": [
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: ump: Fix buffer overflow at UMP SysEx message conversion\n\nThe conversion function from MIDI 1.0 to UMP packet contains an\ninternal buffer to keep the incoming MIDI bytes, and its size is 4, as\nit was supposed to be the max size for a MIDI1 UMP packet data.\nHowever, the implementation overlooked that SysEx is handled in a\ndifferent format, and it can be up to 6 bytes, as found in\ndo_convert_to_ump().  It leads eventually to a buffer overflow, and\nmay corrupt the memory when a longer SysEx message is received.\n\nThe fix is simply to extend the buffer size to 6 to fit with the SysEx\nUMP message."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-26T05:23:08.292Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/ce4f77bef276e7d2eb7ab03a5d08bcbaa40710ec"
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          "url": "https://git.kernel.org/stable/c/226beac5605afbb33f8782148d188b64396145a4"
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          "url": "https://git.kernel.org/stable/c/42ef48dd4ebb082a1a90b5c3feeda2e68a9e32fe"
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        {
          "url": "https://git.kernel.org/stable/c/56f1f30e6795b890463d9b20b11e576adf5a2f77"
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      ],
      "title": "ALSA: ump: Fix buffer overflow at UMP SysEx message conversion",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-37891",
    "datePublished": "2025-05-19T07:19:04.583Z",
    "dateReserved": "2025-04-16T04:51:23.963Z",
    "dateUpdated": "2025-05-26T05:23:08.292Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-37891\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-05-19T08:15:21.710\",\"lastModified\":\"2025-05-19T13:35:20.460\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nALSA: ump: Fix buffer overflow at UMP SysEx message conversion\\n\\nThe conversion function from MIDI 1.0 to UMP packet contains an\\ninternal buffer to keep the incoming MIDI bytes, and its size is 4, as\\nit was supposed to be the max size for a MIDI1 UMP packet data.\\nHowever, the implementation overlooked that SysEx is handled in a\\ndifferent format, and it can be up to 6 bytes, as found in\\ndo_convert_to_ump().  It leads eventually to a buffer overflow, and\\nmay corrupt the memory when a longer SysEx message is received.\\n\\nThe fix is simply to extend the buffer size to 6 to fit with the SysEx\\nUMP message.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ALSA: ump: Se corrige el desbordamiento del b\u00fafer en la conversi\u00f3n de mensajes SysEx de UMP. La funci\u00f3n de conversi\u00f3n de paquetes MIDI 1.0 a UMP contiene un b\u00fafer interno para almacenar los bytes MIDI entrantes, y su tama\u00f1o es de 4, ya que se supon\u00eda que era el tama\u00f1o m\u00e1ximo para los datos de un paquete MIDI1 UMP. Sin embargo, la implementaci\u00f3n pas\u00f3 por alto que SysEx se maneja en un formato diferente, y puede tener hasta 6 bytes, como se encuentra en do_convert_to_ump(). Eventualmente conduce a un desbordamiento del b\u00fafer y puede da\u00f1ar la memoria cuando se recibe un mensaje SysEx m\u00e1s largo. La soluci\u00f3n es simplemente extender el tama\u00f1o del b\u00fafer a 6 para que se ajuste al mensaje SysEx UMP.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/226beac5605afbb33f8782148d188b64396145a4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/42ef48dd4ebb082a1a90b5c3feeda2e68a9e32fe\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/56f1f30e6795b890463d9b20b11e576adf5a2f77\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ce4f77bef276e7d2eb7ab03a5d08bcbaa40710ec\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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